@Ryrie
why so defensive? Why do you think I'm shit talking American for the sake of it?
Look, I'm not blaming or making fun of anybody here, I'm just stating the truth. And duh, I do recognize that they are most likely first cousin, that's why I mentioned it.
Regarding it's incest or not. From what I understand, incest is forbidden relationship by two people who are too closely related to marry each other.
Are they closely related? Yes. Is it too close? In most countries, no. In China and some states in US, yes. That's all it is.
So no, it's not incest in my country and Japan, where the manga is based. It may be incest for your region specifically. But, that's all it is. no need to think that what other people said as offensive. You are reading too much into it.